Transverse Lie: Causes, Risks & Treatment
Transverse lie is an abnormal fetal position in which the baby lies sideways in the uterus. It requires medical monitoring and usually delivery by caesarean section.
Things worth knowing about "Transverse lie"
Transverse lie is an abnormal fetal position in which the baby lies sideways in the uterus. It requires medical monitoring and usually delivery by caesarean section.
What is a Transverse Lie?
A transverse lie is an abnormal fetal position in which the baby lies horizontally across the uterus – neither head-down nor bottom-down toward the birth canal. The long axis of the baby runs perpendicular or obliquely to the long axis of the mother. Transverse lie is classified as an abnormal fetal presentation and occurs in approximately 0.3 to 0.5% of all deliveries.
Causes
Several factors can predispose a baby to lying in a transverse position:
- Multiple pregnancy: In twin or multiple pregnancies, limited space in the uterus can prevent normal positioning.
- High parity (multipara): Women who have had several previous deliveries may have lax abdominal muscles, giving the baby more freedom of movement.
- Placenta praevia: A low-lying placenta can block the baby's head from descending into the pelvis.
- Polyhydramnios: Excess amniotic fluid allows greater fetal movement and increases the likelihood of an unusual position.
- Uterine abnormalities: Congenital or acquired changes to the uterus, such as fibroids, can interfere with normal fetal positioning.
- Contracted pelvis: A narrowed pelvis may prevent the fetal head from engaging in the normal way.
Symptoms and Diagnosis
Transverse lie is usually detected by ultrasound examination, which is a standard part of routine antenatal care. In addition, a doctor or midwife may identify signs of transverse lie through abdominal palpation using the so-called Leopold manoeuvres. The abdomen often appears unusually wide, the top of the uterus (fundus) is lower than expected for the gestational age, and no fetal part can be felt in the pelvis.
Risks for Mother and Baby
A transverse lie that persists until delivery is associated with significant risks:
- Umbilical cord prolapse: After rupture of membranes, the umbilical cord may slip into the birth canal, creating a life-threatening emergency for the baby.
- Neglected transverse lie: If not recognised and managed in time during labour, serious complications including uterine rupture can occur.
- Preterm birth: Transverse lie is associated with an increased risk of premature delivery.
Treatment and Delivery Management
Management of transverse lie depends on the stage of pregnancy and individual clinical circumstances.
External Cephalic Version (ECV)
From 36 weeks of gestation, an attempt may be made to turn the baby into a head-down position using external cephalic version (ECV). This involves applying gentle manual pressure to the outside of the mother's abdomen to rotate the baby. The procedure is always performed under continuous ultrasound monitoring in a clinical setting where an emergency caesarean section can be performed if needed. The success rate is approximately 50 to 60%.
Caesarean Section
If transverse lie persists until the end of pregnancy, or if ECV is unsuccessful or contraindicated, a planned caesarean section (primary Sectio caesarea) is the recommended mode of delivery. A vaginal birth is not possible with a persistent transverse lie and would carry life-threatening risks for both mother and baby.
Spontaneous Version
In early pregnancy (before 32 to 34 weeks), many babies will turn spontaneously into the correct head-down position. For this reason, transverse lie detected early in pregnancy is typically managed with watchful waiting and regular monitoring.
References
- Royal College of Obstetricians and Gynaecologists (RCOG): External Cephalic Version and Reducing the Incidence of Term Breech Presentation. Green-top Guideline No. 20a, 2017.
- Cunningham F.G. et al.: Williams Obstetrics. 25th Edition. McGraw-Hill Education, New York, 2018.
- Deutsche Gesellschaft für Gynäkologie und Geburtshilfe (DGGG): Guideline on Obstetric Management of Abnormal Fetal Presentations, 2020.
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